Hacked account ??

Hey, this is the strangest thing. When I just a few minutes ago went on CPod for the day on my iphone, I noticed my avatar had changed!...and I hadn't changed it! When I retired last night it was still an avatar of Mr Bean's Olympic Dream, and then just now it was some random face I didn't recognise. I came on the computer about 10 minutes later and it was back to being Mr Bean. I double checked my iphone and it was still this unrecognised avatar, but when I refreshed it was back to Mr Bean. How could this be so? Has someone hacked my account? Has this happened to anyone else? Is it possible for CPod to look into this?